Sounds like you've taken the right steps. Heat shield on a stock starter w headers did the trick on my old 70 GTO after cooking a few stock starters. Since originality isn't a concern I would try a ministarter. I've had great success with a Power master w heat shield on my 69.
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Chris D
69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
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